CVE-2023-24532Network attack vector

Incorrect P-256 results via unreduced scalars

Published Mar 8, 2023 · Updated Aug 2, 2024

Incorrect calculation in crypto/internal/nistec before 1.19.7 and 1.20.0 through 1.20.1 allows attackers to obtain wrong P-256 results. The P-256 assembly path accepts 32-byte scalars without reducing them modulo the curve order, so its incomplete addition formulas mishandle equal points. Reachability requires a caller to pass an unreduced scalar through the deprecated crypto/elliptic API; crypto/ecdsa and crypto/ecdh are unaffected.

CVSS severity5.3
Medium
EPSS probability0.82%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect calculation in crypto/internal/nistec before 1.19.7 and 1.20.0 through 1.20.1 allows attackers to obtain wrong P-256 results. The P-256 assembly path accepts 32-byte scalars without reducing them modulo the curve order, so its incomplete addition formulas mishandle equal points. Reachability requires a caller to pass an unreduced scalar through the deprecated crypto/elliptic API; crypto/ecdsa and crypto/ecdh are unaffected.

The record

CVE
CVE-2023-24532
Published
Mar 8, 2023
Updated
Aug 2, 2024
Vendor
Go standard library
Product
crypto/internal/nistec
Classifications
CWE-682
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 8, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.19.7
  2. Affected versionversion=1.20.0-0 <1.20.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Go standard library · crypto/internal/nistecversion=0 <1.19.7; version=1.20.0-0 <1.20.2

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-682Incorrect Calculation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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